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Article

Oxidation Resistance and Microstructure Evaluation of a Polymer Derived Ceramic (PDC) Composite Coating Applied onto Sintered Steel

1
Materials Laboratory (LabMat), Mechanical Engineering Department, Federal University of Santa Catarina, Florianópolis BR-88040-900, Brazil
2
Ceramic Materials Engineering (CME), University of Bayreuth, D-95440 Bayreuth, Germany
*
Author to whom correspondence should be addressed.
Materials 2019, 12(6), 914; https://doi.org/10.3390/ma12060914
Received: 21 February 2019 / Revised: 7 March 2019 / Accepted: 12 March 2019 / Published: 19 March 2019
(This article belongs to the Special Issue Novel Metal Carbide/Carbonitride Materials)
Powder metallurgy is a competitive technology to produce ferrous near net shape parts for diverse engineering applications. However, their inherent porosity increases the susceptibility to oxidation and sealing their surface is mandatory to avoid premature degradation. Alongside, polymer derived ceramics (PDCs), such as silicon-carbonitride, have drawn attention concerning their high temperature and chemical stability. However, PDCs undergo volume shrinkage during ceramization that leads to defect formation. The shrinkage can be compensated by the addition of fillers, which are also capable of tailoring the ceramic resulting properties. This work evaluates the processing of PDC-based coatings loaded with ZrO2 and glass fillers to compensate for the shrinkage, densify the coating and seal the sintered steel surface. Therefore, polymeric slurries were sprayed onto sintered steel substrates, which were pyrolyzed at different temperatures for microstructural and oxidation resistance evaluation. Microstructural modifications caused by the enhanced glass viscous flow during pyrolysis at 800 °C resulted in more homogeneous, dense and protective coatings, which reduced the mass gain up to 40 wt% after 100 h of oxidation at 450 °C in air in comparison to the uncoated substrate. Moreover, no macrocracks or spallation were detected, confirming the feasibility of PDC composite barrier coatings for sintered steels. View Full-Text
Keywords: sintered steel; oxidation resistance; composite coating; polysilazane sintered steel; oxidation resistance; composite coating; polysilazane
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MDPI and ACS Style

Justus, T.; Gonçalves, P.; Seifert, M.; Leite, M.L.; Probst, S.M.H.; Binder, C.; Motz, G.; Klein, A.N. Oxidation Resistance and Microstructure Evaluation of a Polymer Derived Ceramic (PDC) Composite Coating Applied onto Sintered Steel. Materials 2019, 12, 914. https://doi.org/10.3390/ma12060914

AMA Style

Justus T, Gonçalves P, Seifert M, Leite ML, Probst SMH, Binder C, Motz G, Klein AN. Oxidation Resistance and Microstructure Evaluation of a Polymer Derived Ceramic (PDC) Composite Coating Applied onto Sintered Steel. Materials. 2019; 12(6):914. https://doi.org/10.3390/ma12060914

Chicago/Turabian Style

Justus, Tercius, Priscila Gonçalves, Martin Seifert, Mateus L. Leite, Sônia M.H. Probst, Cristiano Binder, Günter Motz, and Aloisio N. Klein. 2019. "Oxidation Resistance and Microstructure Evaluation of a Polymer Derived Ceramic (PDC) Composite Coating Applied onto Sintered Steel" Materials 12, no. 6: 914. https://doi.org/10.3390/ma12060914

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